Aerial pairs of aerial photographs, ie the successive images taken by the aircraft which overlap and contain the property under investigation.
The aerial pair of aerial photographs when viewed with a stereoscope allows us to see in three dimensions and therefore to have a much better view of the ground. It allows us to recognize the heights of structures, the terrain, the heights of trees, the depths of streams and much more.
Careful stereoscopic observation gives the view of the space as if we were present at the time of shooting.
